Nemours as an estate in a relatively undeveloped area had to be self-sufficient, like many country houses of the time (and today no doubt).
One enters the estate via a long drive with an allee of trees (seen at the top of the map below) before reaching the entry court, seen below with a #3 at the English gates.
Unmarked on the map, directly behind the gates from the house is a beautiful marble fountain with a fairy-tale like tower in the background.
Was this some sort of folly for Dupont's grandchildren I wondered? I had visions of a playroom at the top of the tower with a Rapunzel theme.
It turns out to be much more utilitarian than all of that: the tower is filled with machinery and is the pump and water tower for the estate! 
A local stone base with tall stucco shaft, matching the house, is topped with an ornate wooden structure. Notice the clock and weather vane too!
A very grand and picturesque necessity but maybe a tad disappointing for me; I still want Dupont's office at the top or at least the aforementioned playroom!. 
